Fairchild 74LCX16245 service manual

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74LCX16245
Low Voltage 16-Bit Bidirect ional Transceiver

with 5V Tolerant Inputs and Outputs

74LCX16245 Low Voltage 16-Bit Bidirectional Transceiver with 5V Tolerant Inputs and Outputs

February 1994
Revised May 2005

General Description

The LCX16245 c ontains sixteen non- inverti ng bidirecti onal
buffers with 3-STATE outputs and is intended for bus ori­ented applications. The device is desig ned for low voltage
(2.5V or 3.3V) V

ing to a 5V signal environment. The device is byte con­trolled. Each byte has separate co ntrol inputs which could
be shorted together for full 16-b i t oper atio n. Th e T/R
determine the direction of data flow through the device.
The OE

inputs disable both the A and B ports by pla cing

them in a high impedance state.
The LCX16245 is fabricated with an advanced CMOS tech-

nology to achieve high speed operation whil e maintaining
CMOS low power dissipation.

applications with capability of interfac-

CC

inputs

Features

■ 5V tolerant inputs and outputs

■ 2.3V–3.6V V

■ 4.5 ns t

■ Power down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■

r

24 mA output drive (VCC 3.0V)

■ Uses patented noise/EMI reductio n circui tr y

■ Latch-up performance exce eds 500 mA

■ ESD performance:

Human body model ! 2000V
Machine model

■ Also packaged in plastic Fine-Pitch Ball Grid Array

(FBGA)

Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up res istor: the m inimu m value or t he
resistor is determined by the current-sourcing capability of the driver.

specifications provided

CC

max (VCC 3.3V), 20 PA ICC max

PD

!

200V

Ordering Code:

Order Number Package Number Package Description

74LCX16245G
(Note 2)(Note 3)

74LCX16245MEA
(Note 3)

74LCX16245MTD
(Note 3)

Note 2: Ordering code “G” indicates Trays.
Note 3: Devices also available in Tape and Reel. Specify by appending the suffix let te r “X” to the ordering code.

BGA54A 54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide

MS48A 48-Lead Small Shrink Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

Logic Symbol

© 2005 Fairchild Semiconductor Corporation DS012001 www.fairchildsemi.com

Connection Diagrams

Pin Assignment for SSOP and TSSOP

74LCX16245

Pin Assignment for FBGA

(Top Thru View)

Pin Descriptions

Pin Names Descriptio n

OE
T/R
A

0–A15

B

0–B15

n

n

Output Enable Input
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs

NC No Connect

FBGA Pin Assignments

123456

A B
B B
C B
D B
E B
F B
G B
H B

J B

NC T/R1OE1NC A

0

B1NC NC A

2

B3V

4
6

8
10
12
14

15

CCVCC

B5GND GND A
B7GND GND A
B9GND GND A9A

B

11VCCVCCA11

B

NC NC A

13

NC T/R2OE2NC A

Truth Tables

Inputs

OE

T/R

1

1

LLBus B
LHBus A

H X HIGH Z State on A0–A7, B0–B

Inputs

OE

T/R

2

2

L L Bus B8–B15 Data to Bus A8–A
L H Bus A8–A15 Data to Bus B8–B

H X HIGH Z State on A8–A15, B8–B

H HIGH Voltage Level

LOW Voltage Level

L

Immaterial

X

High Impedance

Z

Outputs

Data to Bus A0–A

0–B7

Data to Bus B0–B

0–A7

Outputs

1

A

3
5
7

13A14

7
7

7

15
15

15

0

A

2

A

4

A

6

A

8

10

A

12

15

Logic Diagrams

Note: Please note that these diagrams are provided only for the understanding of logic op erations and should no t b e us ed to estimate propagation delays.

www.fairchildsemi.com 2

Absolute Maximum Ratings(Note 4)

Symbol Parameter Value Conditions Units

V
V
V

I

IK

I

OK

I

O

I

CC

I

GND

T

CC
I
O

STG

Supply Voltage
DC Input Voltage
DC Output Voltage

DC Input Diode Current
DC Output Diode Current

DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature



0.5 to 7.0 V



0.5 to 7.0 V



0.5 to 7.0 Output in 3-STATE



0.5 to VCC  0.5 Output in HIGH or LOW State (Note 5)



50 VI  GND mA



50 VO  GND



50 VO ! V

r

50 mA

r

100 mA

r

100 mA



65 to 150

CC

Recommended Operating Conditions (Note 6)

Symbol Parameter Min Max Units

V

CC

V

I

V

O

I

OH/IOL

T

A

't/'

Note 4: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be oper at ed
at these limits. The para metric va lues defined in the Elec trical Cha racteristic s tables are n ot guarantee d at the A bsolute Ma ximum R atings . The “Recom-
mended Operating Conditions” table will def ine the conditions for ac t ual device operation.

Note 5: I
Note 6: Unused inputs or I/O's must be held HIGH or LOW. They ma y not float.

Supply Voltage Operating 2.0 3.6

Data Retention 1.5 3.6
Input Voltage 05.5V
Output Voltage HIGH or LOW State 0 V

CC

3-STATE 0 5.5

Output Current VCC 3.0V  3.6V

2.7V  3.0V

CC

V

2.3V  2.7V

CC

Free-Air Operating Temperature



40 85

r

24

r

12

r

mAV

8

V Input Edge Rate, VIN 0.8V–2.0V, VCC 3.0V 0 10 ns/V

Absolute Maximum Rating must be observed.

O

V

mA

q

V

V

q

C

C

74LCX16245

DC Electrical Characteristics

Symbol Parameter Conditions

V

V

V

V

I
I

I

IH

IL

OH

OL

I
OZ

OFF

HIGH Level Input Voltage 2.3  2.7 1.7

LOW Level Input Voltage 2.3  2.7 0.7

HIGH Level Output Voltage IOH 100 PA2.3

LOW Level Output Voltage IOL 100 PA2.3

Input Leakage Current 0 d VI d 5.5V 2.3  3.6
3-STATE I/O Leakage 0 d VO d 5.5V 2.3  3.6

Power-Off Leakage Current VI or VO 5.5V 0 10

IOH 8 mA 2.3 1.8
IOH 12 mA 2.7 2.2
IOH 18 mA 3.0 2.4
IOH 24 mA 3.0 2.2

IOL 8mA 2.3 0.6
IOL 12 mA 2.7 0.4
IOL 16 mA 3.0 0.4
IOL 24 mA 3.0 0.55

VI VIH or V

IL

3 www.fairchildsemi.com

V

TA 40qC to 85qC

CC

(V) Min Max

2.7  3.6 2.0

2.7  3.6 0.8



3.6 VCC  0.2



3.6 0.2

r
r

5.0

5.0

Units

V

V

V

V

P

A

P

A

P

A